A device, tool, or substance that makes something longer, wider, or able to reach farther.
From Latin extendere (to stretch out) plus the agent noun suffix '-er', which means 'one who does' or 'a thing that does.' The suffix '-er' creates nouns for tools and agents.
Wi-Fi extenders are probably the most common modern example—they literally extend your internet signal farther into your house, making the technical meaning crystal clear and practical!
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